diff --git a/static/src/components/chat/actions/ToolAction.vue b/static/src/components/chat/actions/ToolAction.vue
index 8fd8090..6bf16d7 100644
--- a/static/src/components/chat/actions/ToolAction.vue
+++ b/static/src/components/chat/actions/ToolAction.vue
@@ -527,7 +527,8 @@ function renderReadFile(result: any, args: any): string {
       matches.forEach((match: any, idx: number) => {
         if (idx > 0) html += '<div class="search-match-separator">⋯</div>';
         html += '<div class="search-match-item">';
-        html += `<div class="search-match-line">行 ${match.line_number || '?'}</div>`;
+        const lineLabel = match.line_start === match.line_end ? `${match.line_start}` : `${match.line_start}-${match.line_end}`;
+        html += `<div class="search-match-line">行 ${lineLabel}</div>`;
         html += `<pre>${escapeHtml(match.snippet || match.content || '')}</pre>`;
         html += '</div>';
       });
diff --git a/static/src/components/chat/actions/toolRenderers.ts b/static/src/components/chat/actions/toolRenderers.ts
index 685d426..3fc5620 100644
--- a/static/src/components/chat/actions/toolRenderers.ts
+++ b/static/src/components/chat/actions/toolRenderers.ts
@@ -479,7 +479,8 @@ function renderReadFile(result: any, args: any): string {
       matches.forEach((match: any, idx: number) => {
         if (idx > 0) html += '<div class="search-match-separator">⋯</div>';
         html += '<div class="search-match-item">';
-        html += `<div class="search-match-line">行 ${match.line_number || '?'}</div>`;
+        const lineLabel = match.line_start === match.line_end ? `${match.line_start}` : `${match.line_start}-${match.line_end}`;
+        html += `<div class="search-match-line">行 ${lineLabel}</div>`;
         html += `<pre>${escapeHtml(match.snippet || match.content || '')}</pre>`;
         html += '</div>';
       });